Fix style and current tab url detection logics.

src/background.js

@@ -217,6 +217,7 @@ function setupHeaderModListener() {
 
 function onTabUpdated(tab) {
   if (tab.active) {
+    delete localStorage.currentTabUrl;
     // Since we don't have access to the "tabs" permission, we may not have
     // access to the url property all the time. So, match it against the URL
     // found during request modification.

src/styles/style.css

@@ -1,6 +1,5 @@
 html, body {
   width: 600px;
-  height: 464px;
 }
 
 a {
@@ -38,7 +37,7 @@ body::-webkit-scrollbar {
 }
 
 .main-content {
-	height: 400px;
+	height: 100%;
 	margin-bottom: 60px;
 }